Here's another way of skinning this one...
$PCName=""
Do
"Enter PC Name or 'q' to quit: "
GetS $PCName
$PCName=Trim($PCName)
Select
Case $PCName=""
"You must enter something!"+@CRLF
Case $PCname="*"
"Cannot incur the auditors wrath!"+@CRLF
$PCName=""
Case $PCName="q"
"Ok, Bye"+@CRLF
Exit 0
EndSelect
Until $PCName